I'm running an Invidia system with Berk HFC, going to keep the cats in just due to regulations here if we get reemed and have to drive over the pits and them check the underbody, massive fines for no cats. (doubt it will happen, haven't even been pulled over for my car yet in 2 years)
I remember looking through all the exhausts years ago, the ones without any crossover seemed to have more rasp and tinnyness to them, pretty sure the x-over pipes and resonators helped with negating this a little.
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